As part of the Indiebound programme, Nielsen BookScan has generously agreed to supply a weekly independent Top 20 bestsellers report.

1 The 78-Storey Treehouse
by Andy Griffiths & Terry Denton
Pan Macmillan  $17.99
9781743535004
2 Dr Libbys Womens Wellness Wisdom: What Every Woman Needs to Know
Dr. Libby Weaver
Little Green Frog Publishing  $39.95
9780473360887
3 Richie McCaw 148
by Richie McCaw
Upstart Press  $69.99
9781927262788
4 Hera Lindsay Bird
by Hera Lindsay Bird
Victoria University Press $25.00
9781776560714
5 Nutshell
by Ian McEwan
Jonathan Cape $38.00
9781911214335
6 Black Ice Matter
Gina Cole
Huia Publishers $30.00
9781775502982
7 Commonwealth
Ann Patchett
Bloomsbury Publishing $32.99
9781408880395
8 Les Parisiennes: How the Women of Paris Lived, Loved and Died in the 1940s
Anne Sebba
Weidenfeld & Nicolson   $39.99
9781474601733
9 Empire of Storms: Throne of Glass
Sarah J. Maas
Bloomsbury $19.99
9781408872895
10 Harry Potter and the Cursed Child 
by J. K. Rowling, Jack Thorne & John Tiffany
Hachette $49.99
9780751565355
11 Guinness World Records: 2017 
Guinness World Records $49.99
9781910561324
12 Things That Matter: Stories of Life & Death from an Intensive Care Specialist
Dr David Galler
Allen & Unwin $36.99
9781877505645
13 Can You Tolerate This?
by Ashleigh Young
Victoria University Press $30.00
9781776560769
14 How it Works: The Dad: Ladybirds for Grown-Ups Jason Hazeley & Joel Morris Michael Joseph  $21.00
9780718184261
15 The Kiwi Pair
by Eric Murray & Hamish Bond Penguin Books  $40.00
9780143574361
16 The Secret Diary of Hendrik Groen, 83 Years Old
Hendrik Groen
Michael Joseph $37.00
9780718182953
17 All Day at the Movies
Fiona Kidman
Vintage  $38.00
9781775538905
18 Barkskins
Annie Proulx
Fourth Estate $36.99
9780008191764
19 The Jealous Kind
James Lee Burke
Orion $34.99
9781409163503
20 The Last Painting of Sara De Vos Dominic Smith
Allen & Unwin $36.99
9781743439951